Steam-engine.



H. ENGEBRETSON.

STEAM ENGINE.

APrLwATIoN FILED 111:0.'27. 1910.

1,004,395, Patented Sept. 26,1911.

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STEAM ENGINE.

APPLICATION FILED 1020.27, 1910.

Patented Sept. 26, 1911.

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HEGGE ENGEIBRETSON, OF MONTEVIDEO, MINNESOTA.

STEAM-ENGINE.

Specification of Letters Patent.

Patented Sept. 26, 1911.

Application led December 27, 1910. Serial No. 599,304.

To all whom it may concern:

Be it known that I, HEGGE ENGEBRETSON, of Montevideo, in the county of Chippewa and State of Minnesota, have invented'certain new and usefulv Improvements in Steam- Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention contemplates the provision of simple and highly eiticient means for controlling the inlet and the exhaust of steam to and from a piston cylinder wherein are mounted two oppositely movable pistons, rods of which are designed to be separately connected to a double crank shaft.

'Ihe invention will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation of a steam engine equipped with my improvements. Fig. 2 is an opposite side view. Fig. 3 is a plan view, with parts broken away and parts omitted. Fig. 4 is a bottom plan view. Fig. 5 shows the two controlling valves.

Referring to the drawings, 1 designates the piston cylinder, and 2 the steam chest, 30 steam being admitted to the latter at the top at a central point, conventionally indicated at 3, in Fig. 3, and in dotted lines, Fig. 4. l/Vithin cylinder 1 are two pistons 4 and 5, the rod 6 of piston 4 being tubular to accommodate rod 7 of piston 5. Steam chest 2, from the central point of entrance of the steam has opposite lateral ports 8, 9, which open, respectively, into two vertically disposed chambers 10 and 12.

13 designates a vertically movable valve which is designed to be reciprocated in valve chamber 10, and 14 designates a similar valve designed to be reciprocated in chamber 12. The reciprocation of these valves may be controlled by any suitable means, but preferably by a walking beam, conventionally shown at 15, which is pivoted at its center and formed with longitudinal guideways which receive lugs projecting from the valves. This walking beam may be actuated by a rod connected to the engine shaft. Each of the valves 13 and 14 is provided with an upper right angular port 16 and a lower transverse port 17. The ports 16 when in register with the lateral ports 8 or 9 will admit steam from the steam chest to pipes which lead to cylinder 1, while when such valves are raised the steam supply through ports 16 will be cut ofi', and the exhaust will occur through the transverse ports 17, communicating with ports 25 in the steam chest, such latter ports and pipes 26 forming passages to the exhaust pipe 27. The valve 13 controls the admission and exhaust to and through oppositely extending pipes 20 which open lnto the cylinder at the ends thereof, while valve 14 controls the admission and exhaust to and through a single pipe 21 which opens into the center of cylinder 1. These pipes 20 and' 21 are preferably located beneath the cylinder and connect respectively with ports which open into the valve chambers 10 and 12. Extending through the steam chest, in line with these ports of the two sets of pipes are exhaust ports 25 to which pipes 26 are connected, such pipes opening into a common exhaust pipe 27 In Figs. 2 and 3 I have conventionally indicated, at 28, a series of connected drain valves, but these form no part of my present invention.

In operation, when valve 13 is lowered and valve 14 is raised, steam will pass through pipes 20 to the ends of the cylinder and force the two pistons toward each other, and at the same time steam previously admitted to cylinder 1 between the pistons will exhaust through pipe 21 and port 17 of valve 14. Vhen valve 13 is raised and valve 14 is lowered steam will be admitted through pipe 21 to the center of the cylinder to force the pistons apart or toward the ends of the cylinder, and the previously admitted steam will exhaust through pipes 21 and port 17 of valve 13. It will be noted that each of the vertically movable slide valves has, in addition to a transverse exhaust port, a right angular port for taking in the steam from the steam chest and admit-ting it to' the piston cylinder, in one instance through a single pipe to the center of such cylinder and in the other instance through two pipes to the ends of the cylinder. The two valves receive the steam from ports opposite each other, leading from the steam chamber, and when such valves are raised they form direct communication with the exhaust outlets, but when in their lowered positions cut oif the exhaust and allow the direct passage of the steam. Y

Any suitable means may be employed for connecting the piston rods to the engine crank shaft; and likewise any preferred means may be employed for operating the valves and for draining the cylinders.

While I have sho'wn and described the preferred manner of carrying out my invention, it will be understood that changes may be made without departing from the spirit of the invention.

I claim as my invention:

l. In a steam engine, in combination, a piston cylinder, oppositely movable pistons located therein, a steam chest, two valve chambers communicating with said steam chest, pipes leading from the valve chambers to opposite ends of the piston cylinder and to the center thereof, exhaust outlets leading from said pipes, and oppositely movable valves located in said chambers and having ports for alternately establishingcommunication between said pipes and steam chest and between said pipes and exhaust outlets.

2. In a steam engine, in combination, a piston cylinder, oppositely movable pistons located therein, a steam chest, two valve chambers communicating with said steam chest, pipes leading from the valve chambers to opposite ends of the piston cylinder and to the center thereof, exhaust outlets leading from said pipes, oppositely movable valves located in said chambers and having ports for alternately establishing communipiston cylinder, oppositely movable pistons located therein, a steam chest, two valve chambers communicating with said steam chest, two pipes leading from one valve chamber to the opposite ends of the piston cylinder, and a single pipe leading from the other valve chamber to the center of the piston cylinder, exhaust outlets leading from said pipes, and slide valves located in said chambers and having ports for alternately establishing communication between said pipes and steam chest and between said pipes and the exhaust outlets.

In testimony whereof, I have signed this specification in the presence of two subscrib ing witnesses.

HEGGE ENGEBRETSON. Witnesses:

ELIAS JAcoBsoN, J. A. MORRISON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

